????????????

????:??????????:??????

??????????????6????????????8??? (????????????)?????????????????????8??????CT???,???,????????,??,???

6??8?????????????????????????,??????? ????????????

??1978????????????,???????????,?(??)?????????????????????????????????????????????????????????,????

?,?,????????????????,???????????????????,???????????????,????CT????,?????

??,???????????????????:?????????1????????33?????????19??U???,???32?????23??????????;?????1??????????????44????????,?????????8??????????????52????????????????????????4?????????

????????(?????????????)?(??????)

?????????????????,???????,????????????????????????????????????????????,????,???,???,??

????????????????????????,??????????,???????????????????,???????????,???????,???(???)

???:?????